<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom',i1===0?'bdtop':'','vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限 -->
              <el-col :span="19">
                <!-- 通过for循环 嵌套渲染二级权限 -->
                <el-row
                  :class="[i2===0?'':'bdtop','vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row,item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 通过for循环 嵌套渲染三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      closable
                      @close="removeRightById(scope.row,item3.id)"
                      v-for="(item3, i3) in item2.children"
                      :key="item3.id"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
                  {{scope.row}}
            </pre>-->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog
      title="分配角色"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="tree"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveRightInfo">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import { userRole_api, deleteRight_api ,getRights_api,setRight_api} from '@/api'
export default {
  data() {
    return {
      rolesList: [],
      setRightDialogVisible: false,
      rightslist:[],
      treeProps: {
          label: 'authName',
          children: 'children'
        },
      defKeys: [],
      roleId: ''
    }
  },
  created() {
    this.userRole_api()
  },
  methods: {
    // 获取用户角色列表
    async userRole_api() {
      const { data: res } = await userRole_api()
      // console.log(res)
      if (res.meta.status !== 200)
        return this.$message.error('获取角色列表失败')
      this.$message.success('获取角色列表成功')
      this.rolesList = res.data
    },

    // 删除用户指定权限
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该用户权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 如果用户确认删除，则返回值为字符串 confirm
      // 如果用户取消了删除，则返回值为字符串 cancel
      // console.log(confirmResult)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      const { data: res } = await deleteRight_api({
        roleId: role.id,
        rightId: rightId
      })
      console.log(res)
      if (res.meta.status !== 200) return this.$message.error('删除用户失败')
      this.$message.success('删除权限成功!')
      // this.userRole_api()
      // 返回的data, 是当前角色下最新的权限数据 防止了展开列的重新收缩效果
      role.children = res.data
    },

    // 展示权限的树形控件  role的实参是scope.row
    async showSetRightDialog(role){
      // 获取到角色id 后面发送修改权限使用
      this.roleId = role.id
      // 发送请求获取角色权限
      const { data: res } = await getRights_api('tree')
      if (res.meta.status !== 200) return this.$message.error('获取权限数据失败！')
      // 把获取到的权限数据保存到 data 中
      this.rightslist = res.data
      // console.log(res,222)
      // 要修改权限就要获取到角色下所有三级权限的id
      // 递归获取三级节点的Id
      this.getLeafKeys(role,this.defKeys)
      console.log(this.defKeys)
      this.setRightDialogVisible = true
    },

    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    getLeafKeys(node,arr){
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if(!node.children) return arr.push(node.id)
      // 如果当前node节点包含children属性，则继续循环并调用此函数
      node.children.forEach(item => {
        this.getLeafKeys(item,arr)
      });
      // console.log(node)
    },

    // 关闭权限对话框
    setRightDialogClosed(){
      // 关闭对话框时清空默认为选中状态数组里的值
      this.defKeys = []
    },

    // 确定提交权限
    async saveRightInfo(){
      // 权限 ID 列表（字符串）获取所有被选中、叶子节点的key和半选中节点的key, 包括 1，2，3级节点
      const key = [
        ...this.$refs.tree.getCheckedKeys(),
        ...this.$refs.tree.getHalfCheckedKeys()
      ]
      // 以 , 分割的权限 ID 列表
      const idStr = key.join(",")
      console.log(idStr)
      // 发送请求分配权限
      const {data:res} = await setRight_api(this.roleId,{rids:idStr})
      if(res.meta.status !== 200) return this.$message.error('分配权限失败')
      this.$message.success('分配权限成功')
      // 重新渲染数据
      this.userRole_api()
      this.setRightDialogVisible = false
    }
  }
}
</script>
<style scoped lang="less">
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>